Mon, Jul 18, 2022 at 09:17:42PM +0200, Maciej Witkowiak wrote: >I found a complete MMU implementation: >https://github.com/eriks5/C128_MiSTer/blob/master/rtl/mmu8722.vhd but I >have no idea how complex the result is. Ideally, a 4-bank MMU and enough of a 6821 PIA (for expanding each 64KiB bank to 256KiB) would fit in a single device. The extra features could be enabled by jumpers on the daughterboard, which would be plugged into the MMU socket. I did not check if it would be technically possible, but it would be nice if the entire expansion could be implemented by something that would be plugged into the MMU socket. I think that disabling the the on-board DRAM would be trivial, by simply never generating any CAS signals for them. Some modifications to the main board might be necessary to disable or bypass some other things. MarkoReceived on 2022-07-20 12:00:05
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